At least 14 people have died after a massive fire broke out in a popular rooftop restaurant in Mumbai Friday.

The fire started in the 1 Above restaurant just after midnight on Friday and spread quickly throughout the Kamala Mills shopping and dining centre. At least 20 people were treated for injuries following the blaze.

"A proper evacuation plan could have avoided this," Dr. Harish Pathak, head of the forensic department at KEM Hospital, told local media. Almost all of the 14 victims died from asphyxiation from the fumes, rather than from the flames, he added.

BBC reporter Ankur Jain was dining in the restaurant when the fire broke out. "It was a happy evening which turned into the scariest night for me," Jain told the BBC. "I was at the restaurant with my sister and friends when we heard someone screaming, 'run there is a fire'. Within seconds, there was a stampede and the fire engulfed the whole restaurant before anyone could realize what went wrong.

"The way to the fire exit was among the first places to catch fire. We managed to escape but not everyone could. We could hear blasts on the rooftop while we were running down the stairs."

Danish Siddiqui / Reuters

Mumbai police have registered a culpable homicide case against the three partners who run the restaurant.

The Times of India reported that a local government body had previously investigated the restaurant three times in 2017 for violations.

India prime minister Narendra Modi posted condolences on Twitter, saying: "Anguished by the fire in Mumbai. My thoughts are with the bereaved families in this hour of grief. I pray that those injured recover quickly."

Alicia Melville-Smith is a homepage editor and reporter for BuzzFeed News and is based in London.